/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Displays a modal message dialog
Returns the result of the modal message box
[EAppReturnType::Type](API\Runtime\Core\GenericPlatform\EAppReturnType__Type) OnModalMessageDialog ( EAppMsgCategory InMessageCategory, [EAppMsgType::Type](API\Runtime\Core\GenericPlatform\EAppMsgType__Type) InMessage, const [FText](API\Runtime\Core\Internationalization\FText) & InText, const [FText](API\Runtime\Core\Internationalization\FText) & InTitle )